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Bednarski P.,Institute of Advanced Manufacturing Technology IAMT | Bialo D.,Warsaw University of Technology | Brostow W.,University of | Czechowski K.,Institute of Advanced Manufacturing Technology IAMT | And 3 more authors.
Medziagotyra | Year: 2013

Burnishing of metal surfaces can affect positively tribological and mechanical properties such as fatigue strength, wear resistance, contact stiffness and bearing capacity. Burnishing affects the entire surface topography, including surface roughness, radii of curvature of peaks and valleys, slope angles and more. We have studied A1Mg1SiCu (6xxx series) aluminum matrix composites with a reinforcing phase of Al2O3 which exhibits good workability but poor machinability. The second series studied was based on an AlSi alloy (A-390) reinforced with SiC - this one characterized by poor workability but good machinability. Materials have been prepared by mixing metal powders with the reinforcement, cold pressing, sintering, hot extrusion and heat treatment. We have determined surface roughness with a Hommel tester; the arithmetical mean for A1Mg1SiCu (A6061 + Al2O3) was ~1 μm before burnishing and ~0.15 μm after burnishing. We have also determined the bearing capacity at 50 % with the same tester: before burnishing 2.30 μm and 0.47 μm afterwards for A6061 + Al2O3; before 2.30 μm, afterwards 0.37 μm for A390 + SiC. Vickers microhardness at the surface with respect to the core increases 30 % for the Al2O3 containing composite and 50 % for the SiC containing composite. Source


Tobola D.,Institute of Advanced Manufacturing Technology IAMT | Brostow W.,University of North Texas | Czechowski K.,Institute of Advanced Manufacturing Technology IAMT | Rusek P.,Institute of Advanced Manufacturing Technology IAMT | Wronska I.,Institute of Advanced Manufacturing Technology IAMT
Medziagotyra | Year: 2015

D2 belongs to traditional steels, frequently used in metalworking industry. Shot peening and nitriding are known to improve the wear resistance of D2. In this work we focus on processes of slide burnishing and industrial low temperature gas nitriding. The D2 steel specimens were first subjected to heat treatments (HT) prescribed by the manufacturer, turning (T), then burnishing (B) and nitriding (N). The reason for turning was achieving appropriate surface roughness. Deformation induced in slide burnishing can be better controlled then in shot peening because of deterministic nature of this process. Four different paths to prepare surfaces were employed: HT + T, HT + T + B, HT + T + N, HT + T + B + N. D2 steel is very sensitive to the final finishing, wear rates vary up to 300%. Two of our procedures (HT + T + N and HT + T + B + N) are much superior to the others. Moreover, in the HT + T + N case, apparently the surface fatigue scaling off takes place. © 2015, Kauno Technologijos Universitetas. All rights reserved. Source


Tobola D.,Institute of Advanced Manufacturing Technology IAMT | Rusek P.,Institute of Advanced Manufacturing Technology IAMT | Czechowski K.,Institute of Advanced Manufacturing Technology IAMT | Miller T.,Institute of Advanced Manufacturing Technology IAMT | Duda K.,AGH University of Science and Technology
Metrology and Measurement Systems | Year: 2015

Modern production technology requires new ways of surface examination and a special kind of surface profile parameters. Industrial quality inspection needs to be fast, reliable and inexpensive. In this paper it is shown how stochastic surface examination and its proper parameters could be a solution for many industrial problems not necessarily related with smoothing out a manufactured surface. Burnishing is a modern technology widely used in aircraft and automotive industries to the products as well as to process tools. It gives to the machined surface high smoothness, and good fatigue and wear resistance. Every burnished material behaves in a different manner. Process conditions strongly influence the final properties of any specific product. Optimum burnishing conditions should be preserved for any manufactured product. In this paper we deal with samples made of conventional tool steel – Sverker 21 (X153CrMoV12) and powder metallurgy (P/M) tool steel – Vanadis 6. Complete investigations of product properties are impossible to perform (because of constraints related to their cost, time, or lack of suitable equipment). Looking for a global, all-embracing quality indicator it was found that the correlation function and the frequency analysis of burnished surface give useful information for controlling the manufacturing process and evaluating the product quality. We propose three new indicators of burnishing surface quality. Their properties and usefulness are verified with the laboratory measurement of material samples made of the two mentioned kinds of tool steel. © 2015 Polish Academy of Sciences. All rights reserved. Source


Janczewski L.,Institute of Advanced Manufacturing Technology IAMT | Tobola D.,Institute of Advanced Manufacturing Technology IAMT | Brostow W.,University of North Texas | Czechowski K.,Institute of Advanced Manufacturing Technology IAMT | And 3 more authors.
Tribology International | Year: 2016

We have end milled surfaces and then applied ball burnishing to specimens of low density high molecular mass polyethylene (LDPE). An important objective was roughness minimization. For selected ball diameters, the influence of burnishing parameters such as force F and burnishing speed f on selected surface geometry parameters has been determined: roughness Ra, total height of the profile Rt, and also the two-dimensional roughness change KRa. We find the minimum value of Ra=0.57 μm and the maximum value of KRa=5.1, both highly desired results. In the best case, Rt has decreased from 14.5 μm to 4.0 μm. Microhardness values, ball-on-disc wear values and scratch resistance testing all show property improvement of milled and burnished surfaces as compared to surfaces milled only. Burnishing decreases the wear rate by 58%. © 2015 Elsevier Ltd. All rights reserved. Source

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